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q in (-oo:+oo)
7/1 = q/4 // - q/4
7/1-(q/4) = 0
7-(q/4) = 0
7-1/4*q = 0 // - 7
-1/4*q = -7 // : -1/4
q = -7/(-1/4)
q = 28
q = 28
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